New user: how to open and run terminal...install driver for Broadcom 802.g wireleiss

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I'm new to Ubuntu and can't find a way to just open and execute the driver. I tried to download the driver, had to use windows to download and then transfer it to a usb drive, then i right clicked on the file, went to properties and allowed it to be executed as a program. The check mark disappeared as soon as I hit the box, and the file I noticed, was marked read only. I tried read and write, but that didn't work either.
What do I do now? BTW, I do not know how to run Terminal, or even what that is, I am that new, and I'm stuck, switching back and forth between windows and ubuntu.
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I'm new to Ubuntu and can't find a way to just open and execute the driver. I tried to download the driver, had to use windows to download and then transfer it to a usb drive, then i right clicked on the file, went to properties and allowed it to be executed as a program. The check mark disappeared as soon as I hit the box, and the file I noticed, was marked read only.